Attachment for lawn-mowers.



P. A. HUDSON. ATTACHMENT FORYLAWN MOWERS.

:APPLIOATION FILED JULY 11, 19 11.

Patented May 7,1912.

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UNITED STATESv PATENT OFFICE.

FRED A. HUDSON, 0F CLARINDA, IOWA, ASSIGNOR T0 CLARINDA LAWN MOWERCOMPANY, OF GLARINDA, IOWA, A CORPORATION OF IOWA.

ATTACHMENT FOR LAWN-MOWERS.

To all whom it may concern:

Be it known that I, FRED A. HUDSON, citizen of the United States ofAmerica, and resident of Clarinda, Page county, Iowa, have invented anewand useful Attachment for LawnMowers, of which the following is aspecification.

The object of this invention is to provide improved means for adjustingone member relative to another.

A further object of this invention is to provide improved means forincreasing the delicacy and fineness of adjustment of one memberrelative to another.

A further object of this invention is to provide means for lockingadjusted parts relative to each other without disturbing the adjustmentthereof.

My invention consists in the construction, arrangement and combinationof elements hereinafter set forth, pointed out in my claims andillustrated by the accompanying drawing, in which Figure 1 is a detailelevation, partly in section, illustrating the application of myimproved device to members adj ustably connected. Fig. 2 is across-section on the indicated line 2-2 of Fig. 1.

In the construction of the device and its application as shown thenumeral 10 designates a fixed member which may be the frame of a lawnmower, and 11 designates an oscillating member, such as a ledger plate,which is pivoted to the fixed member 10 and may be a part of a lawnmower and carry a ledger blade 12. Assuming the parts 10, 11 to beelements of a lawn mower as suggested, it is desirable to provide meansfor adjusting the cutting edge of the blade 12 relative to the cutterreel or rotary cutter (not shown), and to this end arms or cars 13, oneof which is shown in Fig. 1, are fixed to or formed on and extendrearwardly from the oscillating plate 11. As the ears and adjustingdevices are identical at both ends of the plate 11, one only of them isillustrated and described. The arm 13 is vertically apertured in itsextremity and a bolt 14:, having a head 1 1, is mounted through saidaperture and carries washers 15, 16 below and above and in contact withsaid arm. A locking nut 17 is screwed on the bolt 14 and in contact withthe washer 16 and rigidly locks the bolt in the arm 13. The aperture inthe ear or arm 13 prefer- Specification of Letters Iatent.

Application filed July 11, 1911.

Patented May 7, 1912.

Serial No. 637,959.

ably is not threaded. An ear 18 is formed on the fixed member 10 and isapertured in register with the aperture in the arm or ear 13. Theaperture in the car 18 preferably is of larger diameter than theaperture in the arm 13 and is threaded. A socket bolt 19 is screwedthrough the aperture in the ear 18. The external threads 20 011 thesocket bolt 19 have greater pitch than the external threads 21 on thebolt 14:, while. the internal threads of the socket bolt match with andare adapted to be screwed on said external threads 21. A locking nut 22is screwed on the socket bolt 19 and is adapted to engage the uppersurface of the ear 18 and lock said socket bolt in any position in whichit may be adjusted manually.

In practical use the cutting edge of the blade 12 may be moveddownwardly by upward movement of the socket bolt 19 and such downwardmovement of the cutting edge is relatively less than the upward movementof the bolt for the reason that said bolt travels faster in its seatthan the bolt 14 travels in the socket because of the difference inpitch of the threads of the respective bolts. Such movement results in aseparation of the cutting edge of the blade 12 from the reel. Oppositeadjustment to approach the cutting edge of the blade 12 closer to thereel is eifected by downward movement of the socket bolt 19 through itsseat, such downward movement of the socket bolt effecting a lesserdownward movement of the bolt 14 and arm 13 because of the difterence inpitch of the screws 20 and 21. It is to be understood that the lockingnut 22 is released from the ear 18 prior to either adjustment of thesocket bolt 19.

I claim as my invention- 1. In a device of the class described, a fixedmember formed with an ear having a screw seat, an oscillating memberpivoted to the fixed member and formed with an apertured arm, a boltmounted through the apertured arm, a locking nut connecting said bolt tosaid arm, a socket bolt screwed through the seat of the ear and adaptedto be screwed on the first bolt, the pitch of the screw connectionbetween the socket bolt and car being greater than the pitch of thescrew connection between the bolts, and a locking nut on the socket boltadapted to engage said ear.

2. An attachment for lawn mowers, comprising an apertured supportingdevice formed with internal threads, a ledger plate formed with an arm,which arm is apertured in its extremity in register with the aperture ofthe supporting device, a bolt mounted through the aperture in the arm, asocket bolt screwed through the aperture of the supporting device andadapted to be screwed on the first bolt, the pitch of the screwconnection between the socket bolt and supporting device being greaterthan the screw connection between the bolts, and a locking nut on thesocket bolt.

3. An adjusting attachment for lawn mowers, comprising a rigid support,a

ledger plate pivoted on said support, a bolt rigidly mounted on theledgerplate, and a socket bolt screwed through the rigid support andscrewed on the first bolt, the pitch of the screw connection between thesocket bolt and rigid support being greater than the pitch of the screwconnection between the bolts.

Signed by me at Olarinda, Iowa, this 3rd day of July, 1911.

FRED A. HUDSON.

C. W. BISBEE.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents,

- Washington, I). G.

